prosser] FOSSILS INDICATE HAMILTON AGE. 19 
Macrodon hamiltonise Hall (?) (rr) 
Strophodonta perplana (Con.) Hall (?) (rr) 
Orthis vanuxemi Hall (?) (rr) 
Clionetes coronata (Con.) Hall (rr) 
Khynchonella sappho Hall (?) „ (it) 
Michelina (Pleurodictyuin) stylopora (Eaton) Hall (?). The specimens are 
like Pleurodictyum problematicum Goldf. which is regarded as a Mich- 
elina (it) 
Cf. Striatopora (Thamnoptychia) limbata (Eaton) Hall (c) 
It will be noticed that all these fossils are Hamilton species and 
there is no more reason for regarding this zone as belonging to the 
Genesee, than the one further northeast, of which this is the south- 
western continuation. Mr. Winslow was correct in regarding the 
exposures at Lehighton and Weissport as of the same geologic age, with 
some difference in litliologic character, but the fossils show that the 
geologic age is Hamilton instead of Genesee. 
No. 1481 A2. — Exposures in southern part first railroad cut north of 
Bowmaus Station on the Lehigh Valley Railroad. The shales are. of 
blackish to bluish-black color, quite fossiliferous and somewhat slaty, 
due to the folding which has also distorted the fossils. Spirtfera 
mucronata Hall ( ?) and Phacops rana (Green) Hall are common fossils. 
This is the outcrop mentioned by Prof. White as " about 30 rods above 
Bowmans Station," ' which was called Genesee, in which correlation he 
was followed by Winslow and Hill 2 and which is accepted by Prof. 
Lesley in his final report. 3 
Fauna No. 1481 A2. 
Spirifera mucronata (Con.) Bill (aa) 
Chonetes coronata (Con.) Hall (rr) 
Clionetes mucronata Hall ( ?) (a) 
The specimens are nearly twice the size of the ordinary ones of this species, 
and on one specimen the spines do not appear to extend parallel to the 
hinge line. 
Strophodonta perplana (Con.) Hall (?) (rr) 
Cyrtina hamiltonensis Hall (rr) 
Michelina (Pleurodictyum) stylopora (Eaton) Hall (c) 
Dalmanites (Cryphteus) boothi (Green) Hall (r) 
Phacops rana (Green) Hall (rr) 
Homalonotus de hayi (Green ) Emm (rr) 
Nucula corbuliformis Hall (?) (rr) 
It will be seen that, like all the other so-called " Genesee" horizons, 
the fossils show this to be of Hamilton age. 
Farther north in the cut is a rather calcareous stratum which contains 
large numbers of shells, as Orthis. This is probably the same horizon 
'G 6 , p. 108. 
2 An. Rep. 1886, Pt. IV, p. 1374, where it is stated that " only 125 feet of these shales [Genesee] are 
exposed on the north side of the anticlinal fault at Lock No. 14. They are quite like the shales 
■which rise on each side of tbe anticlinal near Weissport;" and see Winslow's-cross section of this 
region. 
3 Sum. Dese. Geol. Penn., Vol. II, p. 1327; where is the statement that the Genesee occurs u about 
30 rods above Bowman's." 
